Hello all, i am looking for a little help but PLEASE do not solve the problem for me, i need to learn the stuff. Below are a list of problems i am having, followed by my code and then the output i currently have

my problems:
1) the style in which the user inputs their numbers for each 3x3 matrix should be - enter all 9 #s and then press enter... as opposed to enter a # press enter (9x)

2) the only place i know where to put the '+' and '=' sign makes it print each time... where should i place it to only print in the center of the Matrices?

3) part of the assignment is to use the void function, i never utilize it in my main, im lost as to where exactly i should put it in

#include <iostream>
using namespace std;

#define N 3

void addMatrix(const double a[][N], const double b[][N], double c[][N]);

int main()
{
int i = 0;
int j = 0;
const int ROW = 3;
const int COLUMN = 3;
double a[ROW][COLUMN];
double b[ROW][COLUMN];
double c[ROW][COLUMN];

cout << "Enter 1st 3x3 Matrix:" << endl;
for (int i = 0; i < ROW; i++)
{
for (int j = 0; j < COLUMN; j++)
{
cin >> a[i][j];
}
}

cout << "Enter 2nd 3x3 Matrix:" << endl;
for (int i = 0; i < ROW; i++)
{
for (int j = 0; j < COLUMN; j++)
{
cin >> b[i][j];
}
}

cout << "The sum of both Matrices is:" << endl;
for (int i = 0; i < ROW; i++)
{
for (int j = 0; j < COLUMN; j++)
{
cout << a[i][j] << " ";
}

cout << "+ ";

for (int j = 0; j < COLUMN; j++)
{
cout << b[i][j] << " ";
}

cout << "= ";

for(int j = 0; j < COLUMN; j++)
{
c[i][j] = a[i][j] + b[i][j];
cout << c[i][j] << " ";
}

cout << endl;
}

return 0;
}

void addMatrix(const double a[][N], const double b[][N], double c[][N])
{
for(int i = 0; i < N; i++)
{
for(int j = 0; j < N; j++)
{
c[i][j] = a[i][j] + b[i][j];
}
}
}

and the output

The sum of both Matrices is:
1  2  3   +   1  2  3   =   2  4  6
4  5  6   +   4  5  6   =   8  10 12
7  8  9   +   7  8  9   =   14 16 18
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>>1) the style in which the user inputs their numbers for each 3x3 matrix should be - enter all 9 #s and then press enter... as opposed to enter a # press enter (9x) Ok, whats the problem with this? >>2) the only place i know where to put the …

• 1

>>1) The format the user should be entering his matrice should be: 1 2 3 4 5 6 7 8 9 'ENTER' right now it is 1 'ENTER', 2 'ENTER', 3 'ENTER' ... etc all the way to the 9th number. what happens if you just put 1 2 3 …

no one, nothing... is there something wrong with the way ive posted my question?

>>1) the style in which the user inputs their numbers for each 3x3 matrix should be - enter all 9 #s and then press enter... as opposed to enter a # press enter (9x)

Ok, whats the problem with this?

>>2) the only place i know where to put the '+' and '=' sign makes it print each time... where should i place it to only print in the center of the Matrices?

not sure what you mean?

>>3) part of the assignment is to use the void function, i never utilize it in my main, im lost as to where exactly i should put it in

that void function adds matrices, so call it before you print out all the
then you can print out the results.

>>1) the style in which the user inputs their numbers for each 3x3 matrix should be - enter all 9 #s and then press enter... as opposed to enter a # press enter (9x)

Ok, whats the problem with this?

>>2) the only place i know where to put the '+' and '=' sign makes it print each time... where should i place it to only print in the center of the Matrices?

not sure what you mean?

>>3) part of the assignment is to use the void function, i never utilize it in my main, im lost as to where exactly i should put it in

that void function adds matrices, so call it before you print out all the
then you can print out the results.

1) The format the user should be entering his matrice should be:
1 2 3 4 5 6 7 8 9 'ENTER'
right now it is 1 'ENTER', 2 'ENTER', 3 'ENTER' ... etc all the way to the 9th number.

2) if you look at the output I am currently getting at the bottom of my first post you will see that there is a '+' sign and an '=' sign after each row, i need to make it so that there is only 1 of each aligned with the center row.

3) thank you very much, i will work at that

[s]3) thank you very much, i will work at that[/s] (<-- supposed to be strike through)

fixed that one, thank you again!

Edited by GSEninja: n/a

>>1) The format the user should be entering his matrice should be:
1 2 3 4 5 6 7 8 9 'ENTER'
right now it is 1 'ENTER', 2 'ENTER', 3 'ENTER' ... etc all the way to the 9th number.

what happens if you just put 1 2 3 4 ... <enter> as your input, it should work.

2) if you look at the output I am currently getting at the bottom of my first post you will see that there is a '+' sign and an '=' sign after each row, i need to make it so that there is only 1 of each aligned with the center row.

so you want :

1 2 3      1 2 3     2 4 6 //and so on
4 5 6  +  4 5 6  =
6 7 9       7 8 9

if so then just do a test case(i.e if/else) when row is 2 and column is the last column.

if(row == 2 && col = lasCol)
cout << A[i][j] <<" + " << endl;

for the other matrix you would have to change the plus to equal sign.

what happens if you just put 1 2 3 4 ... <enter> as your input, it should work.

it doesnt, it takes all 9 numbers as the first number for the 1st row of the 1st column of the 1st matrix

so you want :

1 2 3      1 2 3     2 4 6 //and so on
4 5 6  +  4 5 6  =
6 7 9       7 8 9

if so then just do a test case(i.e if/else) when row is 2 and column is the last column.

if(row == 2 && col = lasCol)
cout << A[i][j] <<" + " << endl;

for the other matrix you would have to change the plus to equal sign.

aha!! makes sense, your a life saver

are you inputting it like this(exactly) :
input : 123456789
or are you putting it like this
input : 1 2 3 4 5 6 7 8 9

The seconds one should work.

:icon_redface:

BINGO!
that was the issue...

makes sense too, i guess if the numbers are grouped together then the software reads it as one #... with the spaces everything is good!

a thousand praises to you

Help me: how to join array a[1,2,3] and b[4,5,6] then become : c[1,2,3,4,5,6]

look up std::merge

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